WANG Yu (1991-), male, Master candidate. E-mail: 691583199@qq.com
A series of orange red-emitting NaLa1-xSmxMgWO6 phosphors were synthesized by a conventional solid-state reaction method. The crystal structure, microstructure, luminescence properties and thermal stability were investigated. The results show that NaLa1-xSmxMgWO6 crystals form in a monoclinic structure with a space group of C2/m. Under an excitation at 406 nm, the emission spectra of NaLa1-xSmxMgWO6 phosphors exhibit a most intense red emission peak at 645 nm, corresponding to the 4G5/2→6H9/2 transition of Sm3+. The photoluminescence intensity of the sample firstly increases and then decreases with the increase of Sm3+ doping concentration. The optimal concentration of Sm3+ appears at x=0.05. The mechanism of energy transfer between Sm3+ is proved to be dipole-dipole interaction based on the analysis of the concentration quenching curve. In addition, the temperature quenching behavior was also investigated according to the Arrhenius equation, and the results reveal that the quenching process of 4G5/2 can be ascribed to the crossover process, and the calculated activation energy is 0.326 eV.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |